27. 非一貫性の例 含まれた研究が1つだけだったら?
27
Only one study (Study 2; 825 participants) provided
a report of the impact of treatment Z on quality of life
in people with syndrome Y.
This study found that Quality of Life scores at follow-
up were higher in the treatment Z group than in the
placebo group (MD 2.17 on the scale from 1 (very
dissatisfied) to 10 (very satisfied), 95% CI 1.20 to
3.91, p=0.01).
As this outcome was measured in only a single trial,
we couldn't assess the heterogeneity, so we
downgraded the quality of evidence by one level (to
moderate).
31. こんな場合は?
研究目的
The aim of the review was to explore
the effectiveness of treatment Z in
adult community-dwelling patients
with syndrome Y.
31
研究結果
Seven studies recruiting 1450 participants met the review
inclusion criteria. The studies recruited community-dwelling
people with severe syndrome Y who had a mean age of 70
years. In five of the included studies (Study 1, Study 3, Study
4, Study 5, Study 7) participants were 65 years or older.
★1つ目の研究の限界は第5回にお話ししたrisk of biasを用います。
質の高い研究と、、、
どういうことかというと、例えば 脊髄損傷に対して介入Aの効果を調べた研究では、盲検化の欠如による影響が死亡率の評価では深刻ではない。しかし、身体診察による運動機能評価であれば、深刻であるといえます。
このように、そのrisk of biasがどの程度エビデンスに影響するかを考え、GRADEを下げるかを決定します。